html{
  height: 100%;
  /*overflow: hidden;*/
}
body{
  height: 100%;
  margin: 0;
}

.cover{
  width: 100%;
  height: 100%;
  background-color: rgba(200,200,200,0.8);
  position: absolute;
  top: 0;
  left: 0;
}

.box{
  width: 300px;
  height: 150px;
  position: fixed;
  left: calc((100% - 300px) / 2);
  top: calc((100% - 150px) / 2);
  background-color: white;
  border: solid 1px black;
  border-radius: 10px;
  overflow: hidden;
}

.titleAlert{
  width: 100%;
  height: 100px;
  text-align: center;
  margin: 0;
  line-height: 100px;
  border-bottom: solid 1px black;
}

.buttonBox{
  width: 100%;
  height: 50px;
}

.button{
  width: 100%;
  height: 100%;
  border: none;
    background: none;

}
